It seems like you are worried about the legality of things. You might want to check the license agreement that came with whatever system you want to use. This is Nintendo's terms of service.
Limited License.
Nintendo. Nintendo grants you a limited, non-sublicensable license to access and use the Services for your personal use only. Such license is subject to these Terms and does not include: (a) any resale or commercial use of the Services or the Materials therein; (b) the distribution, public performance or public display of any Materials; (c) modifying or otherwise making any derivative uses of the Services or the Materials, or any portion thereof; (d) downloading (other than the page caching) of any portion of the Services, the Materials or any information contained therein, except as expressly permitted on the Services; or (f) any use of the Services or the Materials other than for their intended purposes. Any use of the Services or the Materials other than as specifically authorized herein, without the prior written permission of Nintendo, is strictly prohibited and will terminate the license granted herein. Such unauthorized use may also violate applicable laws, including without limitation copyright and trademark laws and applicable communications regulations and statutes. Unless explicitly stated herein, nothing in these Terms shall be construed as conferring any license to intellectual property rights, whether by estoppel, implication or otherwise. Nintendo may revoke this license at any time.
There really isn't any way to use consumer software in a commercial setting legally. Most people just ignore it because enforcement is spotty or nonexistent. The only reason I mention it is because you wrote that you are concerned about keeping things legal.
I used to own retail stores. We received cease and desist letters for employees playing FM radio in the retail space in two locations. You are supposed to pay for that too.