With a brand name model would i still need to got one that's 1.5 times my motor hp? Also would it be possible to have more than one device hooked to to if I only ran one at a time?
Depends..
In the US -- seemingly -- the convention is that you need 1.5x the nameplate HP.
In the EU, we get nameplate power in by kW and nameplate power out by kW and no-one derates anything.
But all our power is 220V (or 3 phase 220 or 380V) and no 110V stuff exists.
A device meant to run heavy loads off 220V will have much higher heating at 110V. About 4x more.
So it will work fine off 110V but will quickly fail if run at full capacity for extended times.
Electronic stuff fails mainly due to heat.
10s k experience.
My hitachi 2.2 kW VFD explicitly supports 3 different configs, for different use.
I would not do such, today, because cheap vfds abound.
A switch for 4+1 wires to connect to the load (220V 2 kW) costs more than the vfd.
Endless ways to bodge the connection, not according to code, and I would neither advise them or install them.
In Finland electrical installers are somewhat responsible.
In germany, wholly responsible.
In Spain, theoretically responsible.
Spanish installs are generally a major snafu and carry little in common with the electrical drawings.
Lots of experience.