With those travel strollers that do offer car seat compatibility = car seat adapters are available, YES, you can pair up those Cybex strollers, even the travel line, with the Cybex Aton 5 car seat. You always have to look for the adapters for that particular stroller you've chosen, and with Cybex, it's actually just the one type for the stroller model, which will be compatible. (E.g. For the Eezy S+2, you need the Eezy S+2 adapters, they is just 1 style, and with that, you can attach your car seat).
About the Lara2 – there are the Maxi-Cosi adapters for the Lara2 model that should work with the Aton 5. Maxi-Cosi, however tries hard not to allow other brands' car seats to be attached to their strollers, so it makes the adapters shorter so that Cbex car seats especially won't fit. However, the Lara2's adaptors are actually on the longer side, so I believe you CAN attach the Aton 5, though I never tried it myself, so I would either try that out in a shop OR order this somewhere you can return the stroller & adapters if it doesn't fit. Again, I believe it will fit, but I can't promise hat 100%, seeing Maxi-Cosi truly stopped being compatible with other brands on multiple models.