I've not heard of low profile yet, but that doesn't mean they don't exist.
The physical size of the fuses in the fuse block under the right front console is mini. Out under the hood you have both mini and maxi. In the trunk you have mini.
If you're still not sure, remove one fuse of the size you need, take it to the auto parts store, and compare it. Once you know the size you can get the Add-A-Fuse while you're there. They cost about $4-5.
Once you have your GPS installed post up some pics.