I see this one looks ok ( pricewise)

but it's only a 6 card rig...

ASUS Prime Z390-P LGA1151 (Intel 8th and 9th Gen) ATX Motherboard for Cryptocurrency Mining(BTC) with Above 4G Decoding, 6xPCIe Slot and USB 3.1 Gen2 https://www.amazon.com/dp/B07HCT5GBD/ref=cm_sw_r_cp_api_i_MSJWG4Z960AMC21H41RJ

Then this one but higher priced "to me lol"

Biostar TZ590-BTC (Intel 10th and 11th Gen) LGA 1200 Intel Z590 9 GPU Support GPU Mining Motherboard. https://www.amazon.com/dp/B09RCQP1HG/ref=cm_sw_r_cp_api_i_XC1EHJCSA5XB2A5N6SRS

I like this one because it integrates CPU already but... Reviews don't look promising....

CREAMIC BTC-37 Mining Motherboard, Mining Machine Motherboard CPU 8 Video Card Slots DDR3 Memory Integrated, VGA Interface Low Power Consume for Mining Machine https://www.amazon.com/dp/B092J315GM/ref=cm_sw_r_cp_api_i_0ZZMYXBXVH8M2BB59511?_encoding=UTF8&psc=1

Annnd

This one seems like overkill but has decent price for the amount of cards it says it supports and looking over reviews doesn't seem to have that many "bad" issues

Biostar TB360-BTC PRO Ver. 6.x LGA1151 DDR4 Supports DX12/HDCP Crypto-Mining Motherboard with MX-4 4G 2019 Edition Thermal Compound (4.0 g) https://www.amazon.com/dp/B095RGGFK8/ref=cm_sw_r_cp_api_i_R6ZA8BHY4PMMWGHEWNJY

And last I found looks real nice but idk if it's something worth mentioning other than the awesome price point with everything included in a kit almost

This guy

SOONTECH Complete Mining Rig, Crypto Mining Rig Frame for Ethereum, 8 Gpu System Mining Rig, Including Motherboard, CPU, SSD, RAM, PSU(without GPU) https://www.amazon.com/dp/B09659G5MR/ref=cm_sw_r_cp_api_i_MZBG980NX03N4FW1P6C5