Can I still use RCBO in this application?
The answer is a qualified 'yes' but it really depends on the level of risk applying here.
An RCBO will detect faults to ground. Usually that is L-E as more volts present to breach insulation, etc, but if you have a N-E fault it will also trip. Indeed it trips on any current imbalance above 15-30mA typically so it also can pick up N-N faults to other circuits, etc.
However, many RCBO do not disconnect the N when they trip, they are
assuming that N really is referenced to true Earth and so the "polarity" of the main supply is correct. If you have a major mistake or fault on that supply that elevated N above Earth then the RCBO will not (usually) make it safe as only L is switched. That is why, for example, in the UK the regulations for caravan supplies require both L & N to be isolated when tripped.
With a socket type that lacks polarity then you don't know if a given live pin is L or N (here "live" means current-carrying, and L=line for elevated voltage w.r.t. Earth) so you might have issues like single pole fuse or switching is in fact on the N-side and so when off an appliance is still at dangerous voltages inside.
Here having some form of RCD protection still offers you good protection against a shock to Earth or grounded metalwork.
TL;DR version is RCBO is far safer than MCB, but unless it switches N (like all RCCB, and a few types of RCBOs) you still have some risk if you can't be sure N is properly Earth-referenced.