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The mixer can be fitted in any direction, you just often find depending on what type of handle you have fitted (eg a lever) that it might be at a unusual angle (90 degrees to what you would expect), or you may find you can see the temperature gauge\dial as its to sitting to the side, so if you plan to to do it chose a suitable valve.
I try and always use Ideal Standard Trevli mixers taps, as its easy to get parts for them regardless of their age, and normally get them from ebay as end of line sales\returns and can pick them up for under £80.
I just wanted to follow up and check if you required any further assistance, and request you rate the service received so I may resolve this case.
I havent heard from you in a few days, and I just wanted to follow up and check if you required any further assistance, if you question has now been answered I would appreicate if you can rate the service received.