Best SIPP that allows employer contributions

My employer has kindly agreed to contribute into a SIPP. Currently with NEST but want to leave as they got rid of the Sharia Fund.

I want a SIPP that allows employer and personal contributions via direct debit. It would ideally want a decent app. I want to invest in a global tracker like VWRP.

It has <10k in it so needs to have a competitive structure at that level.