They are not that difficult to find, all 8 are within Monteriggioni. If you use Eagle Vision, they are easier to spot.
Here is a map to help:
http://guides.ign.com/guides/14302494/page_58.htmlTo pick them up, just run over them. You do not need to put each statuette in the correct location, just pick them up. You will receive bonus Florins if you place each statuette in it's location. 2000 per pedestal completed.