In reply to a post by jabuzzard:

In reply to a post by Zarjaz:

Countersunk is the weapon of choice.

But I doubt that the presence of a couple of screws is going to swing it.

I thought the ONT slid onto the screws? In which case countersunk is never the right choice of screw ever. It's pan head all the time.

My modem was hung with countersunk screws. My ONT the same.
It gets a nice grip on the rear of the device when hanging on the wall.

Pan head screws tend to leave a gap in the slot allowing a modem or ONT to wobble any time they're touched.

Countersunk for me.

In reply to a post by j0hn83:

Pan head screws tend to leave a gap in the slot allowing a modem or ONT to wobble any time they're touched.

Countersunk for me.

If pan head are screwed in to the correct depth then the device shouldn't wobble, if this was for the million pound question on who wants to be a millionaire I would have definitely chosen pan head but maybe there isn't a wrong answer so will be open minded and give countersunk screws a go next time

It's countersunk for me as well. Pan heads can be a bit too fiddly to get right.