Best spot for my rack.

I assume you are asking just from a sonic point of view. Also, I assume the quality of power is the same in all parts of the room. In this case you just have cable length and isolation to worry about. Best cable length is between the speakers, but it is the worst isolation. Best isolation is behind the listening position, but it is the worst cable length. Most people recommend a side wall placement to balance cable length and isolation effects. I have gone with between the speakers for best cable length and dealt with isolation by getting really good stands.

There are only 2 ways in my opinion that work well to position the rack between the speakers:
1) have very low racks that keep all the equipment clearly below the height of the tweeter and midrange of your speakers
2) have enough space behind the speakers to the wall so that the distance from the front of the speakers to the front of the rack can be a meter or more
If you can't achieve either 1) or 2) I think the best is to go for a longer interconnect and only place the power amps (or monos) between the speakers, again, as low in profile as possible. Corner positions for the rack are not ideal either. Too close to the outside of the left or right speaker is bad also, a meter distance should be minimum. I would not put it too close to the listening position either.

Joerg
PS: My system picture is not up to date, the placement has been changed according to what I wrote above. Clearly better soundstage :-)

Agree with Audionut, keep the rack low.

I lowered mine from 36" to 26" last week so the transport resting on the top shelf is well below the level of the midrange drivers.

Sounds and looks better, keeps cables at better position(s) at same time.

The best place for your rack is in another room. If you have an adjacent room that could be used, run the speaker cables through the wall.

Of course, I'm a luddite who doesn't use remotes. If you use your remote all the time, another room probably doesn't work for you.