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Well if you can get the canonical tag in the head section this would certainly be preferred. It sounds obvious that you are dealing with a dynamically generated page rather than a static page or you would certainly be able to insert the tag with any average web editor.

I don't know that too many people would have ever tired this to honest with regard to placing such a tag in the body section. I'm gathering that you need the tag based on numerous results for the same product page, such as page 2, page 3 an so on right.

What type of shopping cart are you using? This can help others answer your question as they may be using the same cart and as such it might be an easy answer. If you could supply a link and/or cart type I might have more insight.

Keyword domain names mean very little. What means everything is your actual company name and how trendy the name sounds and how easy it is to remember. Some of the best ranking companies in certain market segments don't have keywords but they are always #1 in every keyword search. Think about zappos.com which is the worlds largest online shoe store and they do over 1 billion in sales a year. No keywords in the name there but its short sweet and people like it.

Now that doesn't mean not do it. Rather it means don't let this be your focus. A company IMO needs a quality name and slogan behind that name to show what they are about. We operate several websites and some that use keywords and some that don't. Ironically the ones that don't often dominate. If you have a good back links,  social media marketing and really good quality content, then your probably going to rank well. Its the cookie cutter websites that often have a hard time as they don't have unique content to go anywhere. Good luck and I hope that helps.