Is this an okay way to mount gantry to linear bearings?

[PaisleyPCdoctor]

800x600 moving gantry cnc router build.

I want to mount short gantry sides to 20mm hiwins.
I want the gantry mounted on top of carriages, with weight centered instead of mounting them side on.

I have came up with this little aluminium mount/adapter that will attach to the gantry sides with 3x M8 bolts.

I'd love some comments on the concept... is there a better/easier way?
Does it look stable?

I dont know what im doing LOL, please guide me : -)