My recommendation:  Punt. 

I would just recommend renting their modem so you are always receiving the highest speed possible.   

Out of curiosity, what custodian did they recommend to you?  

A good real estate accountant can save you thousands of dollars by leveraging entity selection and formation, tax deductions, cost segregations, bonus depreciation and tax planning.I recommend finding an accountant who specializes in real estate taxation, business taxation, financial planning and tax planning.You may want to consider working with your accountant remotely to expand your options.I would also recommend looking for a accountant willing to work with you throughout the year.

Any recommendations on how many rental properties per LLC?

The BiggerPockets community has excellent book recommendations, such as The Book on Rental Property Investing by Brandon Turner.

If you are familiar with this area, any further recommendations or resources you are willing to provide, I am super grateful. 

I highly recommend the book real estate by the numbers.

As you develop the park I would strongly recommend your homes be individually metered for water, sewer expense prorated and garbage paid by tenants via individual can service. 

BiggerPockets also has a calculator to analyze deals, and I highly recommend you start this as soon as possible, even if you are not ready to buy.