I prefer to do my cutting with other tools, and just clean up the cuts with templates, and a handheld router in a router table.
Flush trim bits like this one do a really nice job, and cut very easily.
https://www.amazon.com/CMT-806-690-1.../dp/B000K29S5G
While you can cut aluminum fine with a router, I'd recommend several light passes.
Keep in mind that cutting aluminum with any woodworking tools is rather unpleasant, as you end up covered in hot aluminum chips.
You have control over where you put your fingers, but you don't know when a saw tooth will come flying at you at 150MPH.
Non ferrous blades are safer, as the negative hook prevents the blade form grabbing the aluminum, especially on a miter saw.
When I need to cut aluminum, I try to always use my table saw, with a cutoff sled. This gives me the best results.
Do NOT climb cut with a handheld router, unless you really know what you are doing. And that goes double for aluminum.