Top camera is certainly a help in locating the individual items particularly if they are all ground based.  It is a while since I used this set you have highlighted but I think I remember that this set is on two levels, one on water level and then a higher town level.  Either that or there is an expansion which adds this twin level.  Anyway in instances like this I tend to set my screen up into a 3 or four port view (small down arrow in the bottom left corner of the scene window).  Now if I have a top front and left or right view I can precisely place any prop.  I use this a lot as I do Sci-Fi scenes and I want to align things on, or reletive to more than one plane.  Once I am happy with a sub-set of props I add them to a grouping so that I can move and scale them as a unit.

 

 

I use Poser 13 on Windows 11 - For Scene set up I use a Geekcom A5 -  Ryzen 9 5900HX, with 64 gig ram and 3 TB  storage, mini PC with final rendering done on normal sized desktop using an AMD Ryzen Threadipper 1950X CPU, Corsair Hydro H100i CPU cooler, 3XS EVGA GTX 1080i SC with 11g Ram, 4 X 16gig Corsair DDR4 Ram and a Corsair RM 100 PSU .   The desktop is in a remote location with rendering done via Queue Manager which gives me a clearer desktop and quieter computer room.