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[Hotel Detective]

It's been a while since I played but from what I remember...

Under the map/TV monitor on your screen, there should be an icon for gadgets. I think it's shaped like a christmas tree, though that might be the factory production screen.
Once you've figured out which button to use, click on it to send out a delivery man to place the object.
(Pro tip: Put a subway station on each estate, and put one right outside the entry to your gadget factory to speed up delivery.)

Some gadets, like PCs and Burglar alarms must be put inside houses. You can either direct tenants to go collect them or, from the gadget factory screen, you can have them delivered to your tenants.

To remove gadgets, send a foreman to demolish them.