TMIC is a good choice for boxster engine configure, because the engine isn't as tall. With our inline config. It would be pretty tall for a TMIC. Nonetheless the hood would have to be remodeled and remade. Not to mention that while the car is sitting, all the heat will "rise" up to the TMIC and possible heatsoak the IC.
Advantage of TMIC, is compact design and generally on an equally design FMIC, TMIC exhibits lower pressure loss, due to shorter piping length. Also, due to the shorter pipe length, the compressor doesn't have to pressurize a longer pipe length = faster boost to the cylinder = less boost threshold