Based on the information provided, it sounds like you are looking for a wireless point-to-point (PtP) solution to provide WiFi coverage to an outdoor area and also provide coverage to rooms inside a building.
The MikroTik SXTG2HnD is a wireless device that can be used for PtP connections, but it cannot be used as a direct access point for clients to connect to. However, MikroTik offers other products that would work well for your application such as the Mikrotik RouterBOARD wAP 60G AP. This device is a wireless access point that can be used to provide WiFi coverage to an outdoor area and also provide coverage to rooms inside a building. It is a powerful device that operates on the 60GHz frequency band, providing high throughput and low latency. Additionally, it has a built-in dish antenna that can be used to direct the wireless signal to a specific location.
Another option to consider is the Mikrotik RouterBOARD cAP ac. This device is a dual-band wireless access point that operates on both 2.4GHz and 5GHz frequency bands. It also has a built-in dish antenna that can be used to direct the wireless signal to a specific location.
Both of these options are powerful and suitable for your application. You should take into account the number of client devices and the type of data traffic expected to make a decision.
Anyway, it's always advisable to consult with a Mikrotik expert or network administrator to ensure the best performance and compatibility with your network.