I use the one in Dewey's picture, also with a skewer mount, as my trailer bike uses a mid motor. Not shown in the picture is a canvas safety strap that will support the trailer arm if the skewer came loose.
With a rear hub, what side are the wires? Best on the right side. Are there enough threads on the left side to spin on an extra nut, washer and the above axle hitch? If I had to do it, I could put one on my rear motor ebike using the present nuts on the axle, but I would worry more.
What I find disconcerting about a trailer is that unless going up a hill, I can't feel the 40 lbs of extra weight, especially with an ebike. I don't have mirrors, but wish I had them to check that the grandkid is still in the trailer. If my wife follows me, the grand kid likes to lean out the side and yell back. I been thinking, take out the screened rear panel.