My questions are:- is it worth investing there in terms of the safety of tenants?

You can’t argue that it’s not worth the price you paid.

Then, you need to keep managing your payments to actually have savings to make it worth while.  

So you are putting in various inputs/assumptions, like gross revenue (total sales prices of homes) less soft costs, hard costs, city fees, desired profit margin (i.e. 15% of gross revenue) = residual value (what the land is worth).

Your personal financial situation (tax records/bank statements and personal financial net worth statement)3.

@Jeremy Hartwig, I know this is a slightly glib answer, but property is worth what a willing buyer and willing seller can agree on.You can use cap rates, but admittedly those can be useless too, for similar reasons that Kevin outlined.  

Money today is worth MORE than money in the future.

It may not be worth it if your long term rent and cash flow are adequate.

I am not an attorney but I have studied this a bit so take it all for what it is worth.

It's possible, but seems worth the risk.