I don't have any recommendations for a particular stand, but as for height, you should be shooting to have the tweeters at ear-level when seated. Being that the M22s are 19.8" tall, and the center of the tweeter is about 3" from the top. So measure how far your ears are from the floor when sitting in your preferred location, and subtract 17" from that to get the hight of the stand which would be the best fit. If there is a stand you like, and the hight isn't exactly right, go for slightly tall over slightly short.
Are these speakers going to be used in connection with any sort of display? That's another factor to take in account. You may want to try to get the tweeters aligned with a mid-line of the display as long as it doesn't put them too far out of level with your ears.
