I’ve never used USB over Ethernet but I do know some who’ve tried but run into problems.
My observatory equipment is hooked up to a local cheap PC in the observatory and can be controlled via Real VNC by any device on the home wired network or even using my smart phone via the house wifi. Real VNC will enable control over the internet and I have been known to start the observatory going and then monitor it using my phone when I’ve had to go out in the car for a short while.
My first observatory PC lasted 7 years and the replacement PC’s power supply blew up after a year but has been going for about two years since. The PC just has a plastic bag over it but no other precautions except that the observatory is regularly dehumidified.