Here I used a 750 lb Harbor Freight lift to raise the front of ZTRs and Riders for blade service. Of course I removed the ATV/Motorcycle lift H bracket from it as it was in the way. For rear end service I use one or two floor jacks and jack stands. This way I drop the transaxles using the floor jacks and don't risk dropping them six feet on the the concrete/asphalt driveway.
Either way you need clearance for yourself to get under the equipment safely. Which you need the correct equipment to do the work safely.
Matter of fact I got a JD 652R currently sitting on four 7-1/2 concrete/cinder blocks as I had to get under it to remove the engine so I could repair it. It would be the same if I had to only adjust the valves as the engine has to come out so the muffler can be remove in order to get the rocker covers off. One stupid design.