A lot of people over here seem to place them there. Some of our WRX's had them placed there as an option from the dealers as well. I like it due to the visibility, but it blocks some of my fuel gauge which bothers me some. Next summer when I get it back out I plan on adding a couple of gauges so I may move it somewhere else. Funny you should comment on this today. It was the first day in about 6 weeks I've moved this car due to the salt we have on the roads this time of year. it was -10 and the car started right up (Even more amazing my 72 VW bus started up too!), it is now sitting it its winter parking spot awaiting spring.
try this for the mount location and wow thats cold i love living where i am townsville always hot here 26-35+ how they both run