Well, I recently bought Paterson's 35mm and 120 contact printers. For me it is important to get good frames, and eventually frame numbers. I write all other informations on back side of contact sheet, so I am not worried if name of film will be exposed on contact sheet. I just write it on backside of sheet. My problem was stiff "holders" of film strips. But, I first put old film in holders to loose it and after few usings, it is OK now, no problems to put film strips into contact printer. As in instrustions tells when printer is not in use, do not close it completely, if you do that, film strips holders will get stiff again.
I think me too don't get name of film on contact sheet... And if you don't put paper properly, you wouldn't even get place exposed "Technical data, date" on sheet too...
But, as 120 contact printer was not enough for 6x7 negatives, I ordered Paterson's contact printer for 11x14 paper. It will serve for other things too, so that is why I order it (for example contact copies of photographs made with 13x18 or other film sizes pinhole camera)... Yes, there is allways option to put 2 frames strip of 6x7 negatives and to use one 8x10 sheet for first 8 frames (4 strips) and tear another piece of paper for remaining strip. And that is another thing I will try...
You can use ordinary glass, put paper on enlargers base, put film strips on paper glass over negatives, and it works. I worked that way for years. But, if you need to repeat same contact sheet several time, and I often have need to do it, then contact printers which have film strips firmly in place is good option, and that is my main reason for buying them...
So, in short, I wouldn't think too much about it. If frames images are good using printer, and you get atleast frame numbers, it is OK. Everything else can be written on backside of sheet. No matter what Paterson tells or not. For example Paterson catalogue tells 120 printer is good for 6x7 negatives, but there is no way to make contact sheet of 10 6x7 frames on 8x10 paper using paterson printer (even if there is way to do that using clear glass only). I wouldn't trust any manufacturer 100 percent...