Digital BW, The Print

I have been to a few exhibits lately and I am showing a few of my own 
pieces, and I am wondering what the consensus is (if any) on signing 
prints. 

I have seen the artist sign the mat below the print, but for pratical 
considerations, I do not want to do this, as I am offering prints for 
sale without the mat or frame. Or is it more common so sell matted 
prints?

I have also seen artists use a mat that has an opening too large for 
the print, effectively floating it. They sign the board to which the 
print is attached. This look tends to leave rather messy edges around 
the margins of the print (in my opinion), unless they are torn and 
that is the look one is going for.

I guess another alternative would be to sign the print directly, 
which seems to detract from the image, especially if you want a 
title. I suppose one could sign, title, and date the back, but it 
would rarely, if ever be seen.

Is there a consensus on this topic? i have yet to see a satisfactory 
method. 

Regards,

Paul G.