Single eyelets are not a problem. Spacers are often required when mounting front racks,and it is easier and often make more sense to put the fender strut inboard of the rack mount. The spacers are required due to some rack designs and dropout configuration. Just make sure to keep the bolts tight. This is a SKS fender with the "break away" connector. My Tubus rack on my LHT has a 5-6mm spacer between the rack and the eyelet, otherwise something would have to bend to get the rack flush against the eyelet. The 3mm of fender stay between the rack and the drop out should not be an issue.