E-Piano positioning; Key alignment

Hi,
should the keyboard of a piano be horizontal or is it ok when it is tilted backwards? I didn't find any references on how to position a piano perfectly.

The background of this question:
I have recently improved my old keyboard stand for my Yamaha P-85, because it was always kind of unsteady on it. What I did was just adding a wooden board on the old stand and placing my e-piano on it. Now its very steady and sits perfectly, but I've noticed that the keys aren't aligned horizontally and tilted backwards. The board itself is horizontal and the piano has rubber-feet, so it seems to be intended by the designers, or they just made a big mistake

I hope someone has an answer to this or had the same problem with his yamaha.

Of course, as with any acoustic pianos, the keys are intended to be perfectly horizontal. Just use your common sense - you won't always have a perfectly designed stand for all keyboards, so as long as it's not TOO tilted back or forward, which I really doubt it is unless you have the worst stand ever, then it's okay. Just make sure it's not too low or too high, naturally.

thanks for your reply
It's not too much, only a few degrees. But i did a bit of research (and asked in a few other forums ) and found out, that this is "as designed" and seems to be the case in many acoustic pianos too (Here are a few examples of actionmodels shown)

Wow, I guess I made a terrible mistake then. I never noticed the keys were tilted that way. I use to play some acoustic pianos in a store I visit sometimes (I can't resist, heh) and never noticed that... Sorry, I really should have know that before speaking.

I took a peek at my P-95 and it indeed seems to be a bit tilted backward (though it could be just the stand... I don't know), and it is a bit more tilted (maybe 2 degrees?) because only the front of it is supported by the stand's rubber rings (too short). But it's not noticeable at all when playing...

Anyway, the ideal will probably be the position it sits when placed on the floor or a table, though tilting a little bit back or forth won't harm. About the height, it has already been discussed throughly many times everywhere