As a bicycle mechanic for decades, I try to avoid putting a heavy ebike onto a workstand.
Easy enough to just flip the ebike upside down and have it rests on the saddle & handlebar to remove the rear hub-motor wheel if need to.
Don't need to pull the rear hub motor/wheel completely off the bike to replace an inner tube, just have the rear wheel rest on the chainstays while the ebike is upside down.