So the engine is behind you but in front of the rear wheels. This is generally thought to be optimal layout for a super car.
Porsche used the mid-engine layout for the 959 for example.
In fact, almost every car have a front or middle engine. The 911 is very unique in this rear placement layout.
It might be pretty rare though, like rear engines cars: hillman imp, Fiat 500, etc and of course vw microbus and beetle which rather brings us back to the 911
yeah, but then with that pedantry applied the Honda S2000, BMW 3 Series, Mazda Miata, and various other cars are technically mid-engine.
FR/MR/RR is basically useless to talk about with regards to performance dynamics; HPDEs and driver coaching has taught me that 9 times out of 10 when someone mentions where their engine is sitting in the car by using FR/MR/RR , what they're really trying to get across is where they felt their center-of-mass was during the drive.
And to that point, a Formula style car might be mid-engine, but most have a suspension and aero adjusted center-of-mass that is as aft, if not worse, than any Porsche out there.