Just saying no need to worry about where LR prints a text box if you follow what (IMHO) is a better practice and don't print text boxes on the face of the print at all. No offense was meant to the original poster, was just offering the observation (again, IMHO) that mechanically printed anything - title, signature, filename, copyright notice, or whatever - on the face of the print or in the border trivializes the photograph.
Not quite. As photographers we owe an awful lot of thanks to an enormous team that make it possible for us to produce a print: camera design and manufacturing team, lens designers and manufactures, film manufacturers or now the scientists who designed our sensors, software engineers, the good folks at Epson or Canon or HP, paper manufacturers, and should I go on? Choosing to use the ability of identifying a print by printing whatever information one wishes to include in the margin of a print is an asset and does in no way trivialize the image. And for those who choose to have their images printed by someone else, the printer's name ought to be included e.g.: "image by...and print by..."
That said, I find that the 'info' box in LR only works well for me for small album or family prints. To do a proper identification on a large print means a trip to PS, so I usually simply title and sign by hand.