Attaching secondary reg inside of fridge

I need help attaching a chain of three secondary regulators inside of my fridge.

Unfortunately I don't have pictures but the plan is to have a single line going from the 20lb tank outside through the fridge wall and attaching to the secondary.

I would prefer it if it were modular (not permanent) and on that thought a friend recommended a strong magnet to hold the regulator to the wall. My only concern with that is if the magnet is strong enough to hold the regulator I wonder if it will mess with the spring/needle inside the guage and throw off the readings?

I'm sure somebody out there has some ideas or personal examples to help me out.

Thank you for taking the time to read this!

I hung my secondary and manifold using those 3M command wall hangers with the sticky tape. The kind where you pull from the bottom and stretch to release. You can buy more adhesive strips. I got the largest size they made, rock solid for over a year so far.

shameless bump