If you’re going to run fibre, run at least a 12 core bundle, it’s probably not going to be much more expensive to run 24 as well, though, I found 12 is overkill for my house -> shed connection. If you can manage it given the space issues, pre-terminated MTP fibres are relatively inexpensive, then get yourself some MTP -> LC or SC pigtails or casettes on both ends, I found some MTP -> LC cassettes on eBay for under AUD$50, also old mellanox SFP+ PCIe cards for < AUD $40 and new SFP+ modules for 10gb fibre were $20. stick OpenWRT or OPNSense on an old computer with these cards and you’ve got yourself a 10Gb router :)
I did spend up on the ubiquiti 10Gb SFP+ aggregation switch though, which made things a bit easier!