You will find that 70*20*18mm / 2.75*0.78*0.7" makes placement straightforward.
Elteco C-mac RV12-1-1-230 8148×0063 Voltage Relay 230 VAC Input: 0.4V-600V AC/DC
What stands out about this piece is that it says KanSmart, and it feels dependable in the hand.
The 500A size means worries about pushing limits during peak usage.