Don Gamble (FlyFisher604) has the latest version of a Fusion 360 post processor for Marlin. You can find it in this topic.
Sixteen months ago, when Fusion placed new limits on the personal/hobby license, they removed rapids. This caused issues with the both the MPCNC and the Lowrider due to lead-screw-driven Z axis having a lower max feedrate than the belt driven X and Y. Don has made some provision in this prost processor for the issue, but, if you are going to be using Fusion 360, it would not hurt to also use a M203 g-code to set the maximum feedrate. Note M203 is specified in mm/s not mm/min. An M500 will save the M203 settings.