Have you ever seen those heavy duty storage boxes for construction sites which when the lid is closed you have to put a padlock on from the front . in which case they are set up so you can't cut the lock off because they are hidden. you could paint one of those in a drab colours and place it in a corner of your room and if someone asks it's a storage container . don't advertise that you have firearms . as in keep quiet . as for mags you can store them with you firearms . keep ammo separate in say a tool box and you can place that in a closet if you have one . you should screw the firearm storage container to the floor so it can't be carried away.
plus if you have wifi in your place get a wifi camera.
Under the bed with a trigger lock, idealy in a gun case that is also locked. That should be enough. Ammo in a drawer or small lockbox. Sure it might get stolen, then again that is what insurance is for.
BLR take-down for discrete transport down the hall/elevator
Bed with a box frame base ? easy to hollow out a space with a lid that is under the sheets so to speak
Never say 'whoa' in the middle of a mud hole.