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If you have any doubts about it I would take it to your local police office and just ask them to take a look and see if they say that they would be illegal. Its your car so you can choose to do what you want to do with it, I wont argue that, I just would make sure that they wont cause any issues. I believe that the fine is between $100-$300 for having blue lights on a motor vehicle without a proper permit. If you get pulled over you may be able to get out of it and tell the officer that your car is a show car and that you use them as cruse lights at car shows. Either way good luck.
My concern would be the following. You go to your local PD and talk to a cop who is nice and says it's not a problem. That's fine until you get pulled over in the neighboring town and tell the officer that Officer XXX at your local PD said you were good to go. Likely, they will not buy that. If you can get something in writing, that would help a lot. I doubt that would happen though.
i have a similar setup, i did five on each side and made a straight line, mine double as turn signals as well, they are the switchback ones... i liked it in the beginning, but dont anymore, the problem now is that, the black bottom part is actually part of the bumper, so if i wanted to get rid of them, i have to get a new bumper.