I finally installed the WeatherTech floor mats in the front. Fits perfect.
I also blacked out the front and back exterior badges to take the Black Widow theme even further.
I didn't find any overlays specifically labelled for the Mirage, so I ordered some from an Outlander and hoped they would be the same. The front more or less is the same but the rear emblem is actually a tad larger on the Mirage! I just trimmed off the edges and laid it flat on top, adhered with additional black silicone.
https://www.ebay.com/itm/394621992053
Playing with the idea of getting this light up badge and using it on the back instead.
https://www.ebay.com/itm/354600372893