Can lego handle multiple algo profiles in parallel?

[systemcrash]

I run a postfix installation. Lego now gets rsa4096 for a few hostnames. I wish to satisfy multiple algos because some systems connect and cannot handle ECC (despite claiming to support TLS1.3), so one should have RSA and ECC in parallel.

my usual lego certs folder is:
/root/.lego/certificates

Postfix can handle multiple chains:

A single file can hold multiple (key, cert, [chain]) sequences, one per algorithm. It is typically simpler to keep the chain for each algorithm in its own file. Most users are likely to deploy just a single RSA chain, but with OpenSSL 1.1.1, it is possible to deploy up to five chains, one each for RSA, ECDSA, ED25519, ED448, and even the obsolete DSA.

# Postfix ≥ 3.4.  Preferred configuration interface.  Each file
    # starts with the private key, followed by the corresponding
    # certificate, and any intermediate issuer certificates. The root CA
    # cert may also be needed when published as a DANE trust anchor.
    #
    [smtpd_tls_chain_files](https://www.postfix.org/postconf.5.html#smtpd_tls_chain_files) =
        /etc/postfix/rsa.pem,
        /etc/postfix/ecdsa.pem,
        /etc/postfix/ed25519.pem,
        /etc/postfix/ed448.pem

Can lego handle different algos/chains like this in parallel? If not - how would I best manage this? Just run lego with differing --path, one for each algo?

Also, when one runs --pem does it also give the pem, or only give the pem?

I get the impression from the code that it's also:

func (s *CertificatesStorage) WriteCertificateFiles(domain string, certRes *certificate.Resource) error {
	err := s.WriteFile(domain, ".key", certRes.PrivateKey)
	if err != nil {
		return fmt.Errorf("unable to save key file: %w", err)
	}

	if s.pem {
		err = s.WriteFile(domain, ".pem", bytes.Join([][]byte{certRes.Certificate, certRes.PrivateKey}, nil))
		if err != nil {
			return fmt.Errorf("unable to save PEM file: %w", err)
		}
	}

	if s.pfx {
		err = s.WritePFXFile(domain, certRes)
		if err != nil {
			return fmt.Errorf("unable to save PFX file: %w", err)
		}
	}

	return nil
}

[systemcrash]

I ask because this doc bit seems contradictory to --path:

When using the standard --path option, all certificates and account configurations are saved to a folder .lego in the current working directory.