Things to consider: height of the table for comfort when opening the lid and loading and unloading the material.
Sound resonance: some tables might naturally amplify the harmonics of the Glowforge fans and other things, so an isolation mat and other things to dampen sound might be in order.
Wheels are a plus for flexibility but could be an issue if they aren’t locking casters. The movement of the head can be pretty strong at times.
Room for the exhaust hose out the back and ensure bottom is clear for ventilation. and then adaptable for a filter if that is going to be used.
Here’s a good discussion including reference to a Homeless Despot tool cabinet.