Speaker Placement

I just bought B&W 802N. Any suggestion how to place them.
They are fed by MF-A3.2cr
Standing up and facing you.

Now, more important than the amp, what's your room like?

Hey Kr4, what if he lies down to listen? Just kiddin Budam, but you gotta admit that was pretty funny!!!
Go to a good audio shop and ask them how much they would charge to do the set for your 802's. This absolutely cannot be done through room dimensions alone and advice you get on the 'gon. You need someone who really knows what they are doing to get it right, and they need to be in the room to do it. Literally an inch one direction or another can make a very big difference (I know, I didn’t believe it either until I heard it). Depending on your connections and luck, this will cost anywhere from a gift certificate to a nice restaurant to a couple hundred bucks to get done. But even at the high end of cost, it is a bargain. Do it. You've already sunk a lot of money into your speakers, give them a chance to sound their best.
Newmanoc is right in that, to do this right, you really need someone to come to your home to do this correctly. Speaker and seating possition locations/variables must be measured and plotted, toe-in/aim dialed in, acoustics considered and recommended, bassed on your needs and options,tweaks,etc. This is the short of it for 2 channels only. Still, there's too many variables that can't be done by emails,faxes,computer print-outs,and telephone conversations! You need experience to get the best out of it. Rives will charge you about $3k for a full on-site job. They do do good with 2 channel though. Others are less, but you've gotta look around.