#3 Roderick Strong ( NXT )
24/7 title is provisioned to get defended across all brands under the WWE banner and not just RAW and SmackDown. If somehow the title reaches the developmental brand, either through superstars like Tyler Breeze (who recently made the jump back to NXT) or if the champion shows up at a Takeover event, then the title could change hands and could eventually get captured by the Undisputed Era.
The first choice would be the leader of the Undisputed Era, Adam Cole, but he is currently the NXT champion. Hence, it would be better if Roderick Strong wins the title.
Roderick Strong could move freely alongside the Undisputed Era who would always fend away most of the possible threats. As a unit, they could protect Strong with the numbers advantage on their side. This run could also lead to their call-up as a unit, even if it's temporary.