I want to utilize for a new rental property and everytime I try to log in, it takes me right back to the login page after I sign in and click "landlord". 

You need to have on hand or access to enough to cover the underlying mortgage, utilities, HOA and various carrying costs in the event the house goes vacant for a few months.

Should I utilize DBAs under my TX LLC for any properties I purchase in TX, instead of creating an LLC for each additional property? 

It is best to have a separate HVAC system for each unit but if the multi family unit is all on one utility meter then you might want to get one of those ones where you can control the system from 2 different units.  

Utility-installed separate meters – cleanest and most “bankable” option long-term.

I joined the platform because I'm really interested in hearing firsthand about the tangible needs of property owners in the real estate world.I’d love to ask: what tools or resources do you wish existed (or worked better than they currently do) to help keep recurring home costs low—whether that’s property taxes, insurance, utilities, or something else?

Portfolios are usually rented so make sure you verify - leases are in place, tenants are current, current condition of each property, utilities/who pays, you have financing in line.

There's different criteria to qualify.Most full time investors utilize DSCR loans to acquire a lot of properties.

Next, a surveyor and land-use attorney will guide you through the tentative map and what life-safety or utility-separation upgrades the city will require.

Keep credit utilization low and always pay your bills on time.