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The Aerospace Development Committee's first Mars probe was not a satellite, but a rover that landed directly. However, this doesn't mean there were no satellites involved.
The last to arrive, the largest Tianwen-5, also known as the Zhu Rong Spaceship, crammed 6 large satellites and more than 20 small microsatellites inside it.
Many of these satellites were not specifically made for the Mars mission; they were retrofitted from existing models. With the "Departing Fire" acting as a relay on Mars, there was no need to worry about signal issues.
And in the notifications to NACA, "Departing Fire" almost arrived at the same time, not raising any suspicions from them.
Now, Tianwen-1 has already begun the active deceleration process and will enter the Martian atmosphere after several orbits, not staying in Martian orbit for too long.
