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I use Wings3D to decide where to put the slots. Export the mesh and import it into the program, mark a vertex in the position you want, and it tells you the exact number you have to plot in. When a vertex is marked, a line under the "file/edit/view...etc." line at the top shows the slot positions, X, Y then Z.
Y is the height in Wings3D, but Z is the height in SimPE. You can just switch them around.
I think the X slot is the same in both.
The Y/Z are a little messy (I think the Y/Z slot has the opposite direction, so if Wings says Z- it's really Y+ in SimPE. I'm still trying to get the hang of that one, but if the slot is in the opposite direction of where you wanted it, you switch the -/+.
To deselect, hit the space bar.
I have yet to figure out multi-grid objects, not sure if they work per grid, but for single-grid objects this method works quite well.
(Wings is free to use/download:
http://www.wings3d.com/ - I haven't bothered to update mine since I currently only use it for this purpose, and still have the 1.4.1 version, but the method probably works with the newer ones as well.)