It is unlikely that the weight will be evenly distributed, and very probably give, as you fear, tilting of the platform with air. This will lead to a necessity of measuring and compensating for each cylinder separately.
One can, of course, hope that a presssure and volume equalizing and interconnection between cylinders will give the necessary accuracy.
As a purly academic exercise, absolutely not recommended:
For air cylinders you will use double acting cylinders in all cases. For this you need 5/2 solenoid valves .
If you use high-quality, or direct acting solenoid valves, you could try to equalize the pressure for all cylinders by controlling the air input to a common feed stock, and likewise control air return pressure out at a separately interconnected feed stock connected to all return ports. The solenoid valves must be constructed to allow this throttling balance of pressure in and out.
The other way is to feed each cylinder by proportional solenoide valves, electronically measure position and compensate electronically controlled for each single cylinder. I believe something like this has been done for theater stages, to speedily control lifting, sinking and all-angle tilting - but the cost!

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