If you don't see the "Install Alongside" option it is probably because you don't have unallocated space on which to install or you have left fastboot/hibernation on in windows 10. Mint or any Linux will not mount a hibernated ntfs. If you don't know what LVM is, you don't need it. You can clearly see that option in your image so make sure you don't select it. I don't use LVM but my understanding is that with the Ubuntu installer, if you select it it overwrites the disk and the explanation is not really clear on that.
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How do I make sure Linux is installing on the correct partition?
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There should not be any partition but rather unallocated space. You can create a partition in windows for Mint but it's kind of pointless as you will need to create a filesystem on that partition for it to be usable and you can't do that in windows. Just use unallocated space and create the partition/filesystem during your install.
If you want to try Ubuntu (Mint's daddy) you should be able to at least determine if you are booting UEFI. Documentation is at their site at the link below. I'm sure there are other OS's but I don't use UEFI so am not familiar with them.
https://help.ubuntu.com/community/UEFI
Also, looking at your boot repair output again, there are no Mint files in the EFI partition where there are windows files. If you reinstall windows again and use UEFI then when you install Mint, you need to also install Mint UEFI. I don't use Mint so I'm not sure how you would determine that on boot. Make sure the settings in the BIOS are UEFI I guess.