download this: https://www.dropbox.com/s/ytimsezu9cl61xx/synoboot_1.02b_ESXi_only.zip?dl=0 the only option available is ESXi, so you should not have problems regarding boot choice, it's for DS3615xs (i find has a better custom package support than DS3517xs).   - extract and upload synoboot.vmdk and synoboot.img in your datastore - create a new VM (HW Version 11 or 13) dependent if you are on ESXi 6.0u2 or ESXi 6.5b - operating system should be Other -> FreeBSD 64bit - set
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