I do lots of testing of apps in real phones, not emulators.
The thing is that the phones must be connected to the PC all day. Because of this, phones battery get swollen and I have to buy phones regularly.
Do you know any android phone which can be connected and on all day all week without getting swollen after a time?
Must be real phones, emulators are descarted.
Get a Fairphone, the batteries in those are removable and I’m pretty sure you can run them while battery is disconnected and plugged in.
Even if not, the replacement batteries are very cheap. I think about 25 in whatever currency.
https://www.fairphone.com/en/