Hiflyer, the HL Compact 7ES is a rather large box, 520mm h, 273 w and 315 d. That's about 20 inches high by 11 wide by almost 13 deep. The Monitor 30 is a bit smaller, 460-277-285, about 17-11-11.5. To find the dimensions of their speakers you need to download the brochures from their "data archive."
I use a 16 inch Target metal stand, the height dictated by the height of my sofa. Tweeters at ear level. Harbeth and Professor Greene of TAS, who has reviewed the Compact 7 and Monitor 40 (very large), do not believe that stands have any function other than to get the tweeter up to the correct height.
W/re amplifiers, again Harbeth and Dr. Greene both recommend high current solid state amps. I use a 150 watt Muse 160 mosfet. Some people do use tubes, and I am sure that a high powered tube or hybrid would be just fine. Those little 3 to 8 watt SET's wouldn't do. I have tried my speakers with different solid state amps down to 20 watts, and they always sound good, but they do much better with a lot of power.
I don't know what kind of power you need with the Monitor 30. My similar sized HL-K6's (now discontinued) need a lot of current, more than the C7's.