Sure but in a regular household all the devices might not be on at the same time, or transmitting at the same time.
Since your devices will be on and transmitting constantly, that is another story.
The S1300 can probably handle 50 clients since it has a faster cpu and is dual core, but the AR750s can probably do around 30 max, so i rounded down a little.
Usually if you have a lot of clients on 1 room, such as some kind of event, you usually have multiple AP’s running at lower power so that they barely overlap, to handle all the clients. So you would have something like 6 or 7 AP’s for 300 clients in one room.