I've been using a Harbor Freight Adjustable Height Heavy Duty workstation #46725 for a few years now. I think it was $22 before discount but now lists for $39.95. After using the discount coupon in Model Aviation, it should be $32.
The pic shows a metal engine mount on a piece of scrap wood, held on top with two c-clamps. Cardboard helps prevent oils from soaking into the top of the stand. I don't recall the brand of metal mount, but it works well. That old EZ-just stand held a K&B 61 40 years ago, but I probably wouldn't use it for anything over a 15 or 19 these days, if I needed to use it at all.
Bob in NEPA