where to put inverter Arctic Fox 990

You only need 150w or 300w inverter. I recommend placing close to the electric panel. Tap on the main 12v battery connection for power and use a small transfer switch to send 120v power onto the circuit of choice. This avoids pulling wire as you will use existing. Put a remote switch on the inverter and you have instant power on demand. Leave it off and all works as normal if the RV is plugged in.

I have and recommend GoPower for low idle draw and provision for a remote switch.