VIkram Aurora, QPA, QKC

Hi, I've worked on 401k plans for a while now, but encountered mega roth backdoor quite recently. I do understand that it has great tax saving for an individual but after digging deeper I read that ACP must be passed for the after tax voluntary contributions even if the plan is safe harbor and passed ADP and ACP for matching. Am I understanding this correctly? Also is there any way to bypass the testing for mega roth backdoor after tax contributions? Thanks!