I normally set the horn on the floor, or have it always held in my hand in risky situations (such as students running and playing around). However, since I just bought a new tenor horn, and I want to play it both, maybe even switching in the same song, I felt I need a trombone stand. Also I don't want my trombone to feel left out, since I already bought a stand for the tenor horn

A shop I can go have K&M 14985, which should be enough for normal operations. However, my issue is: the band room is quite crowded. Also, when the band is not set up and there are spaces available, students (and sometimes alumni too!) always run and play around. Also, I am quite clumsy myself. Therefore, toppling is very likely, and I cannot afford that. The 149/9 seems to be more rigid, but I wonder if any model would be even more sturdy.
Also, since there are many broken music stands, and also drum stands that I can use as starting point for a DIY trombone stand, does anyone has experience building one your own? I once used a drum stand with a rug laid on it for protection; usable but not that stable since there is no support inside the bell.