Keep in mind that a real, hand made signature will significantly increase the value of your art. Just ask Ansel Adams collectors. When my pieces start showing up at Sotheby's auctions, my signature will add millions to their value, I'm pretty sure.
There are a number of gel markers that apply well to canvas before coating. I like silver, it's not obtrusive but it's there if you look for it. I inkjet print my name in 9 point type on the lower right hand corner, positioned and colored to be barely perceivable. Then I sign above that. BTW quite aside from valuation, I think it's very important to have your name legibly visible on the front of every piece. I have gotten a lot of business from people who copied my printed name from a canvas they saw out in the world somewhere, which more than counter-balances the very few fuddy-duddies who object to artist signatures.