Your probably hearing the transformer in the power supply that charges the battery. I’ve heard it in cheap units, but I’ve never heard it with APC brand equipment.

Some phones can be hooked up to an external display through the USBC port. If yours can’t do that, I don’t know of any way to remote control it because they require you to install software, and view a code on your phone.

Many newer devices have an auto crossover network card, so manually setting the connection speed and IP would eliminate the cost of a router.

Baby shark would be my go to. But I’m chaotic evil lol