Let me state here that I don't recommend trying to clamp an aluminium frame securely against the weight of a battery laden ebike.
I think the best options are a bench or wall mount Park stand.
A friend set up his bicycle business with the wall mount clamp attached to a handy column in the shop.
Wall mount.
Bench mount.
Shipping will be less expensive than a fixed or folding stand and you've got the strongest clamp in the business.
I searched for this totally different type online and can't find it. Justin and other shops use little tuning stands.
It only lifts the rear wheel. It's pretty simple and can't be very expensive.
IIRC, it's two hooks under one chainstay welded to an upright that's attached to the point of a V piece that sits flat on the floor under the bike.
It looks like it's all made of 3/4" square rod. I'll ask him or Pol where they get them.
Another friend uses a display stand for tuning his bike.
It's a piece of round rod bent to fit over the down-tube and under the bottom bracket.
It has two legs and lifts the rear wheel.
I'd not think it sturdy enough for an ebike and there are definitely balance issues but it's a good design for a simple, cheap, stand.
My ghetto stand has been in service about ten years. It was inspired by a local Chinese bike shop's
tuning stand.*
It's all made from garbage and cost me bupkis.
It's also heavily dependant on balancing the bike.
The position of the counter weight from an old fire door is crucial but it works for me.
Instructions for cobbling together a clamp from Vise-Grips or pipe clamps are easy to find.
It's always a matter of securing them to an immovable base.
Hanging the bike from joists with a block and tackle arrangement is probably best if it's too heavy to lift.
Look at yacht (sailboat) hardware for good blocks (pulleys). They're strong and come in several varieties.
*Said LBS does have a skookum looking work stand in the back shop.
I think of tuning stands as lighter service versions of true work stands. A tuning stand is all most of us needs for simple maintenance.