Board for reading 3 encoders

Hello
I have retrofitted an aciera F5nc milling machine, I need to read 3 TTL axis scales to improve precision resulting from mechanical errors, the topic is not urgent, I would like to send information to linuxcnc, is Remora EC 500 suitable for reading 3 encoders? or maybe another simple DIY board, possibly mesa 7i92 + diy opto board, for now I do not need any step generator from the board unless simple free IO, best regards

Mesa 7i95T or 7i97T would be all in one, but price might be on the high side for what you need.
You can safely use just a Mesa 7i92T, but must be careful with wiring as the pins are sensitive.
Having said that, i have Mesa 7i92 wired on several of my plasma machines, meaning very high interference environment, and the THCAD is wired with 5-7 meters if cable directly to Mesa 7i92 input, yet i never have issues, ever.
This does imply proper shielding and grounding is a must.
In your case just having good shielded cables and grounding the shield only on the Mesa side inside the box should be fine.

Hello,
Thanks for your interest
I would like to get the opinion of those more knowledgeable than me, I knew it could be done on 7i97 but the price with shipping and customs is high, 7i92 can sometimes be bought from me locally, but I haven't found firmware for 7i92 in this configuration yet, before I make a decision I would like to compare a few options, whether Remora will handle 3 encoders because I think it can with 1, and whether there is another option that I haven't known about yet, I've also read about ethercat but beckhoff modules are even more expensive, best regards

You can get Mesa from Germany or Portugal, so no customs nor VAT as they are in Europe and the VAT is already included:
www.welectron.com
www.eusurplus.com
And yes, i also think Remora can do 1 encoder from what i read about it, so you might ask in their topic if anyone can help add more.
Might also want to check the hal2udp project on github, it has no encoders but should be fairly easy to add them as it uses ESP32.