Analog Sensor / ADCs into Home assistant

Could anyone point me in the right direction to which hardware would be best suited for bringing in 13 or more Thermistor readings into HA? Went down the ESP32 route and found that the temperature was bouncing all over the place. Settled it down by placing a CAP between the thermistors leads. Went from bouncing around as much as 8 degrees C to just 2 C fluctuations from interval to interval. So that helped. But in doing some reading I discovered the ESP32’s ADCs are rather poor as the interference from the onboard wireless and environmental causes poor readings. I’m running HAOS on a NUC, so I can directly connect via serial/USB to say an Arduino or whatever. I suspect I’m missing the obvious. Which is pretty likely. Pretty new to this stuff.