Application of TF-Luna IIC in PixHawk Cube (ArduPilot Firmware)

Alberto, then I think you could go for TFmini-S 1.8.1 version, as I mentioned to you in this thread.

TFmini-S 1.8.1 is also light weight and small in size, its also suitable for small quads.
http://en.benewake.com/product/detail/5c345e26e5b3a844c472329c.html
Or TFmini-Plus with enclosure is also a good option but TFmini-S has better range than TFmini-Plus.
http://en.benewake.com/product/detail/5c345cd0e5b3a844c472329b.html