I recently replaced the acoustic treatment with some new acoustic tiles in my home soundroom.
These are strategically placed such as first points of reflection, etc also four centred on the main oposing wall followed by a line either side along the centre at evenly spaced intervals, also some corner bass traps.
While they look great, I find that due to not wanting a permanent fix I went for the option of using an adhesive velcro option so not to damage the paint on my 50 year old plaster board (ie drywall) walls.
Each tile is around 500mm x 500mm (30 inches x 30 inches in old world terms) and I am using approx 4 to 6 inch strips on all 4 opposing sides of the rear of each tile.
This has led to an ever constant battle with gravity which eventually wins in the end.
While the adhesive velco loves the drywall (although I'm most likely going to need a hairdryer to softten the adhesive first should I ever have to remove it so not to damage the paint surface of the wall), the acoustic foam tiles not so much due to the open cell foam composition.
Is there a solution anyone could recommend that would be a semi-permanent fix to this rather trivial yet annoying first-world-problem which sees me having to pick up and re-attach a couple of tiles every time I enter my sound room?
Any advice would be much appreciated.

-Sean.