Well make sure you think this through, personally I think the one sump will be too small but if you can make it work to your expectations then that's all that matters. Just remember when the return pump turns off you'll loose about 1-2" of water from the DT which will back flow into the sump, so you'll need about 4 to 7 gallons of extra space in the sump depending on the overflow size and flow rate. Also you'll have more than 4' of head pressure, with loses from the pipe and fittings you'll actually be closer to about 7 feet or even 8. With a smaller sump you'll want a smaller flow rate, 5x is probably the max you want.
For the ATO you can either move it beside the stand or somewhere else or run a different kind of ATO system all together. If you have an RO filter and can run a 1/4" line to the tank from it you can set something better up anyway for about $80 worth of parts.
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