Acoustic tile supported by a hanging grid attached to the real ceiling? You'll need a tripod with legs that spread flat to try this but it does work:
Carefully remove a tile in the ceiling and make sure there are not wire or duct work that are above that tile. If there are pick another nearby tile/
Reverse the center column on the tripod or if the bottom end your tripod's center column is already threaded, attach your tripod head to the bottom of the column. fold the tripod legs close tot he column and poke it up through the opening where the tile was. Spread the legs to the flat position and extend the legs enough so that the tripod is resting safely on the grid. if hte building contractor did his job well you wont have to worrry about the weight of the 'pod and camera/lens being safety issue - I've done this with a heavy aluminum 3 series Gitzo with an Arca-Swiss B1 Monoball holding up a big Canon EOS 1Ds Mark III body with a 16-24mm f/2.8L II lens and PocketWizard ControlTL MiniTT1 attached just don't try to get the ceiling to support yourself as well.
Getting camera pointing at the right spot can be tricky. This is one of those tasks that either working tethered - if the cable, computer and computer operator aren't in the picture - works great or for more flexibility get a CamRanger (http://www.camranger.com
) to wireless focus, adjust camera settings and trigger the camera. Pointign the camera in the right direction will require you physically adjusting the position and zoom setting but after that the CamRanger can handle just about everything else.
Attached is a photo I did for an ad campaign using this technique.
This was a very small room so I did something something similar for the lighting - mounting the lights on the ceiling grid using Lowel CM-20 "scissors" clamps. The lights are three Canon Speedlites, each [pointed at a different area in the room and each set to a different beam angle. They were triggered by the PocketWizard ControlTL system. There is a fourth Speedlight, with a green gel on it behind the foot of the table.