ok cool,
if there are def no eyelets at the drop out ou can a proper rack using either:
P-Clips (all four points – all on the seatstays)
or use a seat clamp rack adapter (a few different makes of makes – M -part, Salsa) at the top and P-clips at the bottom.
of even a axle/QR adapter so the lower part of the rack attaches to the QR.
If you use P-clips get rubber lined steel one. P-clips are cheap.
BUT
would give serious consideration to the Carradice SQR – you get a decent waterproof back and a stable mount – they are 16litre and you can get a lot in – note if you want to take a laptop and/or you have a small frame the ‘slim’ version is the one to go for.