I made a set of those and love them! I glued the joints except for the bottom one and used a quick release pin in that joint so I could take them apart like someone stated above.
I fly an Air Force flag and American flag.
If you want to get specific there are rules about flying the American flag with others, rules usually come with the flag when it is purchased. I'm active duty, so when I see one not on the correct side or lower/smaller than the other flags it gets to me, but at least they are flying it!