Leapfrog Creatr 30x30cm Mirror Bed Positioner

The concept of stickers on my Leapfrog printer sucks, so i bought some cheap 30x30cm mirrors and use these positioners with some clamps to hold the mirror in place on the printbed. The heat is fine transferred to the mirror and im using the cheapest hairspray with perfect sticking results. The with PLA at bed temp on 60 degreees most objects just fall off after cooldown. With ABS it sticks a little more. Alternatively i put the mirror with the object in the freezer for some time and then its jus