In the meantime, you can use a solid metal orchestra music stand(Manhasset type). Set it anywhere, to any height, and swival it almost flat so the lip will keep the laptop from falling off.

It is stable and it doesn't obstruct eye contact with the audience.

pa4X 76 ,SX900, Audya 76,Yamaha S970 , vArranger, Hammond SK1, Ketron SD40, Centerpoint Space Station, Bose compact