I built a heavy duty table out of scrap wood for my A1 and ordered a side table for my A1 mini, both worked well minus the small vibrations the printers had while working, even directly standing on the concrete would make some noise. So, here is my fix; A Pad that is flexible enough to absorb vibration and thick/ sturdy enough to aid in leveling.

Best results i've found is print with Bambu TPU 95A HF with 5 walls and 25% infill (user preference on the infill shape)

If you need to remix it to be smaller or thicker feel free to!

Let me know if there's any improvements you recommend! 

also sticks very well to the Textured PEI plate, might need to use a release agent to prevent damage.