You can have as many as you like....The Stand must have had close to a dozen, thinking back, but always do things for the right reason--this isn't my book, but do you really need 5 people to show 5 facets of your world? If that's the primary reason for them, I'd be a bit leery.
ymmv
I understand your point. Let me break down a very brief summary of the plot and each POV:
It's a future US where the POTUS has become a dictator and is fighting a multi-faceted insurgency. The insurgents are the protags and each POV show a different faction.
1. A leader of the gov't in exile that is nominally in charge & working towards a retun.
2. A sergeant in a regular military unit which will engage in various battles in the book.
3. An undercover agent of the govt' in exile in the White House who's become the POTUS's bodyguard. This gives me eyes on my antags and their happenungs
4. A guerilla leader in the Midwest, his group has ties to a faction that is a somewhat rival of the 1st POV.
5. A Special Forces leader in a different region who's developed a plan to collect various guerillas in the East coast to then march on th capitol
The 6th would be another undercover person who is a commander of a unit the POTUS's son has been given command of and has a contentious relationship w/him. There's more to it & all of them than I can say, but this is a run down of their roles.