Before I switched to digital, I was running the AKK Race VTX on quite a few of my builds - its light, its small, its in-expensive and it did a real good job.
It doesn't come with any mounting holes, so i created this plate that it can be zip-tied to and then screwed on top of any 20x20 stack.
As a bonus you can at the same time ziptie your rx below the plate.