Currently, I'm using Yamaha RX-V2067 with typical 5.1 retangular bookself type speakers. I'm considering adding Mirage Nanosat as surround back and presence speakers. My existing bookself speakers are being setup on speaker stands and pointing towards the listeners. However, the Mirage nanosat speakers are strangely shapded at 45 degree pointing upwards when mounting on speaker stands. If I add 2 as the surround back speakers on stands, the sound will be directly towards the ceiling as the speakers are facing 45 degree upwards. Will this cause any issues?