I am listed on Furnished Finder, for almost two months now.

Tenant shall properly use, operate and safeguard Premises, including if applicable, and landscaping, furniture, furnishings and appliances, and all mechanical, electrical, gas and plumbing fixtures, and smoke alarms, and keep them and the Premises clean, sanitary and well ventilated.F.

MTRs are always furnished. - MTR guests expect a hospitality experience, much like STR.

Also, would you consider doing a furnished rental for one or more of the units?

They're having the str furnishings moved out and renting it long term until the str market improves.

I'll incur start up cost setting up my STR; like furnishing my STR. 

I haven't seen any statistics on this, but anecdotally we're also seeing a lot of conversions to MTR, which makes a lot of sense if your property is already fully furnished and you have the systems in place for guest management. 

You will receive most if not all your benefit in year 1.Year 1 is where you will spend money furnishing the house and potentially taking bonus depreciation via cost segregation study.Year 2 and onwards, assuming you got a performing asset is where things will reverse tax wise and you will likely be reporting positive taxable income.

Furnish Finder, corporate housing sites, relocation companies, etc?

I haven't had luck connecting with them yet to advertise my property to them as an MTR.I've had it listed on Furnished Finder for a week - with no furnishings in it yet, but with comments that it will be furnished soon.