If your Tapo H200 already has a doorbell and a few cameras, count camera slots before ordering another device. A dual-lens camera can use two slots, so the number of devices on the shelf is not necessarily the number of slots in use.
Make two lists, not one
TP-Link lists four camera or doorbell slots for the H200. Compatible dual-lens cameras count twice. Sensors, buttons and similar accessories are in a separate capacity category; removing a contact sensor is not a way to free a camera slot. Count only devices connected to the H200 you are planning to use, not every device visible in the Tapo app.
Do the arithmetic on your current setup
Write one row per device: exact model, hardware version if shown, which hub it uses, and slots consumed. Start with four and subtract one for each compatible single-lens camera or doorbell and two for each compatible dual-lens camera. List any devices you cannot identify as unknown rather than assuming they cost one slot. Then add up the slot requirement of the proposed purchase.
Example: one single-lens doorbell, one single-lens camera and one dual-lens camera use 1 + 1 + 2 = 4 slots. That setup is full although there are only three devices. With just the doorbell and dual-lens camera you have one slot left: sufficient for one compatible single-lens addition, not another dual-lens camera.
Check two independent conditions before checkout
First check that there is room. Then check that the exact camera or doorbell supports your hub and the feature you want, such as recording to it. A free slot is not a compatibility guarantee. For that separate check, use our Tapo camera and hub hardware-version guide and confirm the model with the seller before paying.
If you are short by one slot, compare replacing or reassigning an existing device against buying more hub capacity. Before dropping a device, write down what coverage or recordings you would lose. Before pricing a second hub, check that your intended recording arrangement and accessories work with it; include storage, shipping and tax. If the only open slot is already reserved for a doorbell, count that future doorbell now rather than buying twice.
Source: TP-Link’s US hub capacity FAQ. The examples show slot arithmetic, not tested model combinations or live prices.
