Tvheadend

I use a SAT IP server (although not with a Pi). Have a look at
https://smile.amazon.co.uk/Telestar-DIGIBIT-HD-SAT-Reciever/dp/B008OVPYCQ/ref=pd_sbs_1/259-9681372-2912120?pd_rd_w=4R1IG&pf_rd_p=b3232d54-1e37-435b-b370-81046eef630a&pf_rd_r=YJ5V78PBX1EC46FG5142&pd_rd_r=920c1c64-0c3c-4c05-b6d6-b5402a7b06ee&pd_rd_wg=jBXFh&pd_rd_i=B008OVPYCQ&psc=1

or

https://www.amazon.co.uk/Triax-400-SAT-Transmitter-4XDVB-S2-LAN/dp/B00N0O5QFC

Thanks, I got one like the triax (mega sat) and connected it to a Synology NAS as there is a build for DSM 7. 8 tuners!

Why don't you try this with RaspberryPi
TBS5520SE Multi-standard TV Tuner USB Box
https://www.tbsdtv.com/products/tbs5520se_multi-standard_tv_tuner_usb_box.html
It does not require external power source.

Or you can go for newer model, that needs external power source
TBS5930 DVB-S2X/S2 TV Tuner USB Card
https://www.tbsdtv.com/products/tbs5930-dvb-s2x-or-s2-tv-tuner-usb-card.html

Both devices support DVB-S2X standard as well, plus
TBS 5930 supports VCM and multi stream, but you would not needed if only
tuning to Astra 2E / Astra 2F / Astra 2G (28.2°E) for now

Thanks, but I went for the Megasat - Synology DSM7 now doesn’t work with USB-based tuners.