Somehow I missed the thread earlier.
In any case, Mesh network equipment isn't needed for a mobile home. Asus RT-AC68 routers served me very well. They don't have AX or any new finagled tech like wave 6 nor 6e. What said at your budget a slighter older model will still work just fine.
https://www.amazon.com/ASUS-Dual-Band-AiMesh-Router-AC1900/dp/B00FB45SI4?th=1
If you don't mind a used model, Amazon Warehouse sells one for under $50, which is a very good deal given it should have still one year warranty.
If you feel more adventurous, you could install a 3rd party firmware on it like FreshTomato or DD-WRT to unlock many enterprise router features
freshtomato.org