What are the taboos for opening a signboard?

Buy an old calendar, choose a good day to light up, not at noon or at night, and avoid single and double firecrackers and salutes.

Hanging horizontal signs shall not be tilted. There are many reasons for hanging vertical cards. It's best to find someone who knows Feng Shui. There are also some precautions on the internet.

Last sentence, don't be too superstitious. It's good to have this kind of thing.