Using portable. I don't see a need for an inline. Just use your machine to put down your preconditions. And, when the situation dictates(rat nastys) using your brush head with the vac off. Just be aware of the volume you are putting down. No need to hold the trigger open. Let the tool work .
Same when extracting. No need to flood , putting down more than the machine will pick up. Take your time, bumping the trigger .
A good distributor will help you with product selection.
Or, a lot of people here ,LOL as well.
Impossible to sift through all the juice de jours!!