PLease help with ro hose configuration

You pretty much have it.
I did install a tee and valve between the membrane and DI for both testing the RO only TDS and rejection rate but also for access to RO only water for other uses like drinking, pet watering and cooking.

I prefer to change my MaxCap cartridge when I first start seeing any TDS but waiting a little longer is acceptable.

I think you can find most of these tips on Spectrapures FAQ page and in their Sponsors Forums on most reef sites they sponsor.