Placing things on walls?

How do you place, say, a monitor on the wall? They all just sit on the floor. Thanks.

1) 'Float' it. Use a stack of safes, desks, etc to get it to the height you want, then remove the objects from under it. Yes, it will stay there, floating in mid-air.

2) A lot of bases use the tech teleport beacons to simulate a bank of wall monitors giving views of the city. These are made to be wall-mounted.

There are also two crafted items, the Monitor Bank and Mega Monitor, that mount directly on walls as Control Auxiliary units that attach to the main Control unit in a room. Check the wiki for details on what's needed to craft them.

I don't know how to stack things either, Ironblade. lol.

There are guides for stacking items in this forum. Look up in the stickied threads and you'll see guides and resources for stacking.

I didn't even read the guides. Place a floor safe. Place a second one. Move one around so that you manage to stack it on top of the other. It's a bit tricky, since you can actually have them intersecting so you can 'stack' one halfway up the other.

Once one is on top of the other, you can remove the one on the bottom. Then you can add more on top of the floating one or, even better, stuck to one side of it and expand laterally. Just mess around with it. That's how I started.

One useful tip: it's sometimes helpful to move your camera position so that you're looking up from under the floor. That can help when you're stacking in mid-air.