Really, it's not totally predictable. Larger tank, larger group, and better odds it's no big deal. Yes, some people do find it advantageous to rearrange the tank (or temporarily remove decor and make the tank really open) so there's not established hangouts to defend and everyone has to adapt to the new territories (or no territories). A trick some use is to introduce new additions at night. When they wake up they're just there already, rather than appearing to 'invade' an established group and territory.
These steps aren't always necessary, it all depends on the particular group, oftentimes especially depends on the temperament of your alpha. It can also depend on the attitude of the new fish, whether any of them come in trying to make waves or stay low key. In some cases juvies are more likely to be accepted as no big deal, still being immature they don't really threaten the status quo in the group. On rare occasions you might get large fronts that will actually eat small fish of their own kind, fairly rare from what I've seen (14-15 total years personal experience with fronts, 8 years being on a well known cyphotilapia forum). The overall point here is that they can vary quite a bit in temperament and behavior in a tank, and with fronts you can't always take individual experience and extrapolate it to what will happen in every other tank.
So, really the answer is to some degree you'd have to wait and see, or you may have enough of a read on your own group (how mellow they are-- or not) to have an idea what to expect. But imo your tank size and group size is in your favor.