As far as single or two point , I like both , for straight two point a Vickers is hard to beat , but if you want the flexibility of going between two and one point , Magpul MS slings , as you can configure them as you like.
For the forward sling point , If it was the 18.5" barreled one with the shorter mag tube, I'd say source a GG&G front sling point , ether loop or QD, but with the 20" barrel full length mag tube, I'd go with a magpul barrel clamp, this can be used with a H&K type hook ,magpul paraclip or a QD sling swival , this will bring it back , so it's not way out there, the one for the reminington fits the 500/590 , they also make one just for the 590A1 heavy barrel.
The mesa stock adapter has QD sling points on it as do some stocks ,I like the magpul CTR myself ,it has QD points. another option is to use a receiver sling plate , never been happy with the sling plates , but that's just me.