On my heated underblanket, the connection is on the right side when you lie on it. I find the connection a bit awkward because it's a hard button that rests on the bed when I'm lying on it. The button is on the top of the right side for me. If I were to sweep my underbed, the connection would be on the bottom left. So theoretically you could use the connection on the left as well as on the right. It's just that it's on the top and on the bottom.
Otherwise, I am very satisfied with the product.