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You can mount both dishes on the chimney - this is preferable to any type of roof mount. Just make sure the 90 cm dish does not block signal to the DirecTV dish - remember that the elevation angle the dish appears to be aliming at is not its true elevation - the LNB is offset - so leave lots of room above it when mounting the 90 cm dish, assuming you mount the 90 cm dish above the DirecTV one. Do not use the J-tube from a DirecTV dish - it likely is not strong enough to support the higher windloads of the 90 cm dish, especially if you will have a motor as well. The signals will not interfere with one another.
Also, when choosing a mounting point on the chimney for the Fortec 90 cm dish, make sure there is enough room to attach the stabilizer bars - at least one of them. Assuming the Fortec dishes use stabilizer bars; I think they do.
kat
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