I use two generic camera tripods spaced 4' apart for my Oehler screens. Then, that leaves plenty of room in the middle for my second chrono, a ProChrono. This way I get two velocity readings for each shot.
The spacing of the two tripods provides for plenty of stability, so the tripod quality is less important than with just one chrono support.
"For every complex problem there is an answer that is clear, simple.....and wrong." H. L. Mencken