There are many ways to get a dsb plumbed into your system, Like dr said a remote dsb is pretty easy to ad on as long as you don't mind a container next to your stand.
Will try to explain this as best as possible.
Firstly you gonna need a container/drum/storage box, something easy to drill into for feed pipe and outlet.
I found those big black storage containers one can by at pick n pay work well for this.
You will need to make sure that the remote dsb container sits higher than the sump not by much a 100mm or so is ok.
This would be for a gravity fed return. Pumping in and pumping out will not work.
A small power head in your sump would have to feed the remote dsb, plumb this with flexible silicone tubing. Whatever size tubing you use for the feed make sure that your return is at least double the size to ensure the return water flows back easily.
Your return pipe would be better if made from say 50mm upvc waste pipe, available from any hardware store, plumb your dsb return pipe back into your sump, this must be gravity fed. The return inlet needs to be at your optimum water level so say 250mm from the bottom of the container. Remember your dsb would only need to be 10cm to 15cm so another 10cm of water surface above is cool.
So its pretty simple remote dsb, water pumped in and gravity fed back. where you position it is up to you. above, next to anywhere as long as gravity plays a role it is cool.
Remember to flood test make sure that your sump will be able to hold the extra water if you have a power failure.
I think that is about it if anything is unclear just ask.
Good luck.