Although any electric insect killer works inside the home, some models excel at it. Only a small percentage are specifically designed for use indoors.
Traditionally bug zappers protect large outdoor areas from insects, and are often overkill indoors. They look cartoonishly large in many spaces. Smaller, less expensive zappers are typically a better fit.
Indoor bug zappers are still a niche offering. The selection is expanding but there’s a lack of reliable brands in the category. For this reason, some will be better served by using an outdoor zapper that’s known to last, even indoors, particularly if they’re covering a large space.
That being said, let’s look at your best options.