I use the tray and have it lined with close fitting 2x4’s for a flat surface level with the ramps so a regular small floor jack can lift the car as it sets on the 2x4’s. I also have smaller jack stands that fit nicely. Or I fit blocks between the jack arm and the axle since I’m not under the car and don’t use stands.
The nice thing is I can lower the lift and work on the brakes sitting on a stool. I just use a two step stool to reach and refill the master cylinder. Mighty vacuum make it a one man job.
I just can’t see how anybody would prefer on the floor with jack stands over using a lift. It is so much more convenient working standing up vs on your back on the floor. I don’t care what beer your drinking changing a transmission or starter on your back on the floor sucks.