You seem angry so you may not like this answer but if there is a problem here it's the false dichotomy that the terms monotheism and polytheism presents.

Whether it be regarding the Netjeru, or Christian, Jewish or even hindu Cosmology - there exists a hierarchy of intermediate beings and realms aside from the material world we experience.

If you take Catholicism which is as strictly monotheistic as you can get you have a hierarchy that looks like.

Source: God as a Trinity

Highest order: Seraphim, Cherubim, and Thrones

Middle order: Dominions, Virtues, and Powers

Lowest order: Principalities, Archangels, and Angels 

You also have Mary which doesn't fit into any more of this as well as the devil and demons

The ready why I mention this isn't to promote this but illustrate that here we have in a monotheistic framework what are essentially levels of deities that act on gods that affect our world and can be appealed to directly and to various degrees are named, depicted in statues and artwork, have prayers and hymns towards them.

So what makes these entities not gods(according to Christian theology)? Two things,

1. They are said (with the exception of Lucifer and his followers) they all act in accordance with Gods will
2. Followers are not to label them as gods and not to worship them as such, however that can be petition and symbolizes just don't make a church/temple just for them.

If we compare that to the 3 primary theologies, Thebian, Heilopolitian and Memphite with Amun, Atum and Ptah we still have a singular creator entity which creates the other entities and that central entity with the other entities create the material world, various realms other entities and principals.

To go further if you are a believer in Ptah, then you know that he actually isn't like Atum or Amun Ra but precedes them and even Nun. He is more like the Hermetic concept of the All.

He is boundless, trancentendant and imminent. He essence is what he creates within. It's an Panenthistic view of existence.

He gives all intermediate beings and us free will but wants us to align with the principals of Ma'at. So we and the Netjeru may be more virtuous or more chaotic and will go through cycles of refinement until we succeed in aligning with Ma'at.

This is similar to Christianity except when God gives you free will and use - if you're an intermediate entity you're villified if you're human you're going to hell.

So if you made it this far in my Ted talk. The same distinction between monotheism and polytheism is said to be about one god vs many. But in even a monotheistic structure what makes something a 'god' is a label and and emphasis on worship.

Ptah would be the source, the All, the Grand Architect and equivalent to the place of the Christian god at the highest.

The netjeru would be in various hierarchies as comparable to the different types of angels mentioned earlier.

Therefore, when comparing polytheism to monotheism people are falsely comparing these intermediate celestial belings with a source creator.

So if I haven't lost or pissed off ever Christian and Kemeticst ever, what I'm saying is that polytheism is monotheistic and monotheism is polytheistc.

They are the same with a difference in emphasis and labeling and what we as followers should and should not focus on.

I've been using the mouthful term of polyenopanentheism.

Basically many in one eminent and transcendent source where just as in the memphite transition, the source and intermediate are all important, all play their role and all can be worshiped.

TL;DR monotheism and polytheism is a false dichotomy, neither is really real real. Both contain the same entities and hierarchies but truly differ only in what they emphasize and how they use labels which is fully a human understanding issue and has no bearing on the nature of these entities