@anon26953564’s GSI ROM eOS-Q-20210116-x runs on my treblezied Galaxy S7 ‘herolte’. The 4G LTE reception is slightly variable, but good. It always depends on the network quality of the provider.
To get a comparison, I installed LeOS-Q-20210117-full-x. The 4G LTE network quality is as good, slightly fluctuating in the range as stated above and is not surprising because the same Vendor.img was used.