Without access to a SERM such as tamoxifen (nolva) or toremifene then you are left with the over the counter AI's.
They all 'work' but some have different side effects, those based on ATD can cause loss of libido in some.
Rebound reloaded looks good.
In answer to the question are they ok to be used alone:
Depends on your cycle, I would be wary of running them after a cycle of something very suppressive like M1T, but most of the time they should be fine. The danger with using an AI for PCT is the possibility of oestrogen rebound when your PCT is over. If run alone I would suggest tapering down the dosage gradually to try and avoid this.