Systems which use prepaid cards or member cards/codes are better for the landlord (less incentive for theft), but are even more costly - unless your building is sufficiently large, the costs may not be justified.  

I have a home equity line of credit which I set up for this purpose with a more than sufficient limit.Should I provide them proof of the line of credit?

Unless you're willing to borrow money from some friends/family, hard money lender, etc. then your max purchase price is about $500k for this; unless you can find a property that's "self sufficient".

And wouldn't it also require that rents increase at a proportional pace to then be able to service the post-refi debt with a sufficient DCR?

What we most care about in a case of a crash is having sufficient cash flow from rent and being able to wait it out. 

@Kyle J.My post in that linked thread directly and sufficiently addresses your current query. 

It's natural to want to shift the responsibility for those expenses on to the tenant as they slice your profit margin for the year down to nothing and start to hack into the bone for a loss.And this one big reason is why self-sufficient handymen typically do well in SFR, especially the high-maintenance lower categories, while others do not.

If there’s sufficient room, yes, I would do it. 

As long as your work income is sufficient I see no issue in you not getting a FHA loan at a good interest rate. 

If you have none of them, it will take a tremendous amount of hustle to succeed.It may be that your resources aren't sufficient in your current market, but that you may do better in a market with lower barriers to entry.