Use the UCC28070 and then concider if you want to run it as a 4PH PFC. There is examples in the datasheet and eval-board papers.
2PH/4PH SMPS as PFC has large advantages over single phases such as smaller ripple current on your output capacitors and the EMI is easier to cope with on the input.
Your overall magnetic volume will also be smaller with a 2PH than on a 1PH.