They aren't really "stand up" although you can fill them that way. I just use it laying flat in the bottom of my boat, don't really attach it to anything. It does have several D-rings on the bottom that you could use to attach it if you wanted. It is an OEM Zodiac bladder, I'd have to check on what the model number is.
I put quick disconnect fittings on the bladder and fuel line so I can swap it out easily for refill or for another full bladder.
Here's a snapshot of what it looks like. Not the greatest pic, but it gives you somewhat of an idea.