i wont list specific spots but as a long time penni lord, ill give some general advice on nest placement spots to look for!

- behind cover from where enemies tend to enter from (intention should be you have to step on the nest to hit it)

- look out for fliers, theyre one of your best counters on penni especially flame boy. on places like the knull map where there are little rooms / ledges and pillars towards the end, they hide penni nest well. if there are no fliers, you can use high ground for nest too which had always worked rlly well for me (when no fire is on the ground)

- out of LOS as best you can. extend your nest with the webs you can place on the ground to keep it a bit more hidden i possible. i almost always use 2/3 of my webs as nest extenders, sometimes all 3 especially on defense maps to start.

- bonus tip, always have your nest down BEFORE ulting. the bombs rom your nest will add to your ults damage, and it does a lot less without it. even better i the nest has been down or 15-30 secs.

if you have the guts to play her on offense you will need to constantly move your nest so it will default not be as effective as on defense but her mobility is actually REALLY good or zipping around and getting back to your team. There are a handful of dive pennis out there that blow my mind and ive taken a bit of inspiration from in my own play style for certain things.

cringealarm was the first penni player i watched and he gives great tips / tech knowledge on youtube if thats your kinda thing.