LiFePO4 (Lithium Iron Phosphate) packs are at least as safe as lead-acid. I still wouldn't have one in our living area, but I wouldn't have lead-acid there either.
For your MPPT look for a "universal" unit that can handle 12V, 24V (maybe 36V and 48V) and the highest input voltage you can find (most seem to be about 150V ish). We have a couple of PowMr units that handle up to 150V input, they are definitely of the "low-cost Chinese" variety but work well enough if you don't push them to the limit.
If you find something locally, post here so those-that-knows can pass judgement, there are many, many fake units