The beautiful 2022 Moto Guzzi V100 Mandello

[Grumpy Goat]

Looks like the rack needs a large plastic plate like Givi uses when mounting a top case.
Any pictures out there of the rear rack without the top box on it.

The plastic Givi Universal mounting plate (which I have on my RS) needs an existing rack to attach to, and the Mandello does not have a rack hence the scaffolding that needs to be added, as you show above. I had to go this route with my Yamaha - complete rack kit with the monokey plate.