Reddit reviews Set of 4 - 1" Dia x 1-1/2" L. Inexpensive Aluminum Sign Standoffs, Anodized Aluminum Finish; Architectural Quality; Project your pictures, graphics and other signage out from wall. Great for outdoor use.
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Anodized Aluminum FinishMade of high quality Solid Aluminum1" Dia x 1-1/2" L.Panel Hole Dia.: 1/4" - Panel Thickness: Up to 1/2" maxSet of 4. Includes No. 8 Screw and Anchor.
Non-mobile: aluminum standoffs
^That's ^why ^I'm ^here, ^I ^don't ^judge ^you. ^PM ^/u/xl0 ^if ^I'm ^causing ^any ^trouble. ^WUT?
On the cheap side I would use 3M Dual Lock, it's similar looking to velcro but WAY stronger. Instead of hooks and loops it uses opposing mushroom tops, the one I linked is the medium strength (250) and I think a 4-5 cm square on all four corners would be more then strong enough to hold up an A2 aluminum print (don't use too much, it is strong!). It's also nice that unlike velcro you use the same material on both sides, so you don't have to keep track of what you put on the wall or print.
A step up from that in price would be aluminum standoffs. Nicer looking, but much pricier and requires drilling a hole in the wall.