I'm about to purchase a HRM and wonder if I need to worry about any interference between the HRM transmitter and my Shimano Flightdeck wireless transmitter. I have never used a HRM and am not sure how these things work.

I have a second question about the Flightdeck:
I want to move the display unit from my (road) handlebars onto my Profile Airstryke aerobars (onto the add-on horizontal connector piece). Is there some alignment requirement between the display unit and the transmitter unit that I need to worry about, or is it just distance from transmitter to display that counts? The Shimano manual is useless for this question (as it is in general).