So just posting this if anyone is curious.

The t slot Proclip adapter works great with the MM3.

I already had the phone mount and just added the double plate.I need to run the wires behind the dash still.

The center mount isn't for everyone but just posting in case someone was curious about an alternative.

Dual-T Mounting Adapter with Tilt-Swivel - Item: 215199

Horizontal Extension Plate for Two Devices - Item: 215397

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