For Determiner-Quantifiers you can follow one of these patterns
(D-Quantifier examples: two students, a sailor, many sailors):
- QE + no + NP + CM
- NP + QE + CM
- NP + CM + QE
Where QE means Quantity Expression, NP means Noun Phrase and CM means Case Marker (postposition).
Add to that that you can shift quantifiers around (they float) to some degree, then you see that there really is not only one way to express quantities.
So in your case, it's construction 2.
NP + QE + CM
Nurse + 8 person + OBJ Marker
Be aware that you can't just swap any construction for the other at all times! For example, phrases describing amount like "takusan 'many', syoosuu 'small number', tasuu 'large number'" are not usable with construction 2 (NP+QE+CM).
- John wa takusan no hon wo yonda.
- *John wa hon takusan wo yonda.
- John wa hon wo takusan yonda.
'John read many books.'
In this example, takusan ("many") is not compatible. An indicator is that those words not fitting for construction 2 can't be the argument of a verb independently:
*Takusan wo suisensita. ([someone] recommended small number/many)
San-nin wo suisensita. ([someone] recommended three)