I use a 3" x 12" PVC pipe to hold my various automotive funnels in the garage. Due to the shelves the previous owner installed, there's not much wall space to mount my PVC pipe on the wall. So, I designed this simple stand to stop the pipe from falling over (as it's done many times).

If you store your funnels without drying them, I would recommend putting (or making) some sort of drip tray. Or, just put stuff a shop rag into the middle of the stand.