Some options:
https://www.smartdesks.com/laptop-labs.asp
https://www.smartdesks.com/mfi-lectern-podium.asp
https://www.smartdesks.com/PDF/SPECS-MPLEX/MFP-302642-LKF.pdf

Freedom podium/lectern with Freedom link cart (actually the cart may be more useful for us than the podium!):

For example we could lock a laptop to podiums where there isn’t enough space to attach a swing arm and desktop mount:
Kensington Laptop Locking Station ($80).

Probably the best would be a monitor swing arm (FWD110B Chief monitor wall arm mount,$80) with a Mac Mini mount / bracket such as the MacCuff, $50.