Hi redd and welcome,
That seems to be the standard way of doing an install..... if your comparing it to the way mine was installed.
In fact the gaps around mine are huge and let the rats come and go at their leisure. Depending on how it has been done (a picture tells a thousand words) it might be possible to cover the gaps quite easily.
Now whether you feel it is the installer job to do this, or yours, is the next question.![]()