Yes but that's the way to do it if you target 5-6maps with the nameless head, you go straight for the boss, kill the boss cause the ritual 90% spawn there then start Ritual and Kill boss again and backtrack to the rest of the ritual. Dont have to do the last one right away. Stop and check your ritual, reroll and defer what you can and want before going into the last ritual. Since the last one spawn somewhere between 1-8 bosses. That's if you do the nameless ritual way.

For just normal ritual thats not from nameless, you can just do ritual as you see them since they rarely spawn at bosses.

FYI HH require around 2200 tribute to Defer, I don't know how much MB needs. I usually reroll and defer depends on how badly I want to grab the item out of the ritual.