Sometimes you can find used stands on Craigslist. People buy them for a project then never haul their boat home again.
There are "boat stands" (more vertical) and "sailboat stands" (longer, more diagonal.) I found a set of sailboat stands on CL, but then never took my boat off the trailer. The flatbed trailer was too narrow to use the "sailboat stands," so I built a cradle that integrated the screws and pads from the stands. Then bought a few shorter "boat stands" to go in close underneath. I think they came from "scaffoldmart.com"
Building a cradle is undoubtedly cheaper, unless you find a good deal on used ones.
As far as height, probably the E27 will use the shortest ones they sell. Like, the depth of the keel plus a few inches.