No, I didn't. This was my first ever check ride for the IFR. Class 1
here in Canada. I'm not sure what the equivalent is elsewhere. Class
1 = multi engine, non center line thrust; 2 = multi, center line
thrust; 3 = single engine.

Usually (in the US) one gets a pilot certificate for single engine (usually land) airplanes, then the instrument rating (in a single), and then pursues a multi rating. Nothing I know of says it can't be done backwards though.

If you get your instrument rating in a single, and then get a license for a twin, I don't know whether you need a separate instrument (add-on) checkride for the multi. I can't find it in the regs, though something in the back of my mind makes it
familiar.

Makes me wonder why you'd limit yourself
to a center line thrust aircraft only, since there really aren't many
of those. Besides the Cessna 336/337 and some weird WWII German
aircraft, I can't think of any others.

I was told that the C336/7 was created so that a person with a single engine rating could fly a twin engine airplane (since there would be no critical engine, and no adverse yaw, and no blueline). However, the FAA decided that not only did you have
to have a multi-engine rating =and= a type rating for that particular aircraft. However they made it possible to get a multi rating that would be limited to centerline thrust if you wanted. Advantages would accrue to those who wanted it just to
fly the C336/7 (owners, for example) and so didn't need all the training in adverse yaw and such (and to keep it all current)

Jose
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