Join Date: Feb 2006
Location: Space Coast, FL
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I don't think you have any problem with the way you've tilted this TV. I essentially have done the same thing with a 50lb 47" TV atop a chest of drawers in my bedroom, and it's very stable just sitting there.
As for not having a place for a TV holder kit, I certainly don't know your physical lay out , but there are likely to be 1-4 VESA-standard screw holes in the back of your TV panel that could be used to improvise a way to secure the TV to the back of your cabinet, if it's really a concern.
Otto Pylot's above comments are indeed worth noting, depending on where you're located.
When in doubt, do the right thing.