Text rotation

Hello, first time posting - yay!

I have several pieces of center justified text (contour lables) that are at various angles. We would like to make all the text read from the bottom of the page, regardless of contour angle or "correct practice". I've selected all the text, then using the element info box, changed all the text to zero rotation and it works - except the text rotates around the "left bottom" justification instead of the "center center" justification.

Can anyone shed some light on this and help me rotate the text globaly at once?  Thanks!