  Proton trajectories along LHC beam 1 (clockwise direction) in the vicinity of
the LHCb Interaction Point (IP8) for the most recent LHC Run 4 optics
(HLLHC1.5) were presented. On this basis, three possible locations of forward
proton detectors were identified: 150, 180 and 430 m from IP8. For these
locations geometric acceptances were estimated. For the proton relative energy
loss, $\xi$, these limits are $0.05 < \xi \lesssim 0.1$, $0.025 < \xi \lesssim
0.1$ and $0.003 < \xi < 0.013$, respectively. The influence of boost of the
central system due to the acceptance of LHCb detector on $\xi$ was discussed.
Finally, the impact of pile-up was presented.
