Can I input Yelp, City Search, Etc reviews for my customers clients?

I wasn't 100% sure if that was something frowned upon or, even worse, something that could get my reviews/clients banned from the service. Basically, lets say I am working with ABC Hardware Store and they already know that their clients are not "Technologically Inclined" enough to go to these sites and submit a review themselves... Could I recommend to them that they get their customer reviews written on paper then input them myself? If I do, should I use proxies or can I submit them all from my same IP. Any drawbacks to this type of method that I should be aware of? Sorry for the wordy post, I'm just not looking to do something that will hurt my clients.

the trend now is to incorporate QR code marketing into offline businesses. So what you would do is to generate QR codes that direct offline customers to these review sites and leave their reviews that way.

Print and display the code with instructions and place them on prominent places like cashier, entrance or even the toilet. The shop staffs might need to be trained to educate customers on the "how to" and of course, customers need to possess smartphones and nowadays who don't.

Unfortunately, these customers actually might not have smartphones...is there any other way to do this without using smartphones?

I read one Guru's report where he said that he did this sort of thing. He kept the written reviews for backup. Another thing you could do is put the reviews on the store's website. And some people have said the same review on different review sites is OK. I don't know.

Two things to be careful of. Don't use the same IP for the different customers. Go to Starbucks, McDonalds and use their WiFi... It looks real spammy if all of a sudden 5 reviews from 5 customers show up on the same day or even in the same month when there may have been only one review all year.