HGLRC Zeus Nano 16x16/20x20/25x25 25-350mW 5.8GHz VTX - U.FL

It delivers 350mW.

The mounting holes can be used to get M2 25x25 and 16x16 and M3 20x20.

What they forgot to tell is that M2 20x20 is also possible by using one of the 25 andone of the 16 holes. Fits perfect.

You also could just sticky pad it on the colling case and put a zip tie around it.

This thing is robust, light, has relatively large solder pads and jsutworks out fine. Solid recommendation for small analog builds.

Compact, lightweight VTX with solid performance. Great for small builds, but watch your wiring voltage.